Pavement fracturing machine



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PAVEMENT FRACTURING MACHINE Filed Oct. 14, 194'? l -2 Sheets-Sheet 2 INVEN TOR.'

Patented Jan 9, 1951 *UNITED STATES PATENT OFFICE PAVEMENT FRACTURINGMACHINE Ayers B. Putnam, Chicago, Ill.

Application October 14, 1947, Serial No. 779,705

4 Claims. (Cl. 262-14) My invention relates to implements for fracturingpavements, and is designed as an improvement over the pick-axes orpneumatic chisels now in use for that purpose.

It is one object of the invention to change an implement of the abovecharacter from a handloperated or supported one to a rotary hammer orbreaker which is carried by a Vehicle and receives power therefrom toinict fracturing blows on the pavement in rapid succession.

A further object is to design the novel rotary hammer or breaker with acircularly-grouped series of arms formed with chisel ends, and torevolve these arms with impulses driving the said ends against thepavement with considerable force.

Another object is to construct the novel rotary hammer or breaker as anattachment for a tractor or similar vehicle, the drive for the machinebeing secured from the power take-01T of the tractor.

An additional object is to design the novel machine in a manner to makepossible the employment of fracturing units in gang or series formationand gain a relatively large area of application. i

A further object is to construct the novel machine along lines ofsimplicity and durability.

With the above objects in View, and any others which may suggestthemselves from the description to follow, a better understanding of theinvention may be had by reference to the accompanying drawings; inwhich- Fig. 1 is a side elevation of the rotary hammer or breaker asmounted on a tractor;

Fig. 2 is a view in front elevation of the rotary hammer or breakermounted on the side of tractor;

Fig. 3 is a View in side elevation showing the rotary hammer or breakeralone, or removed from the tractor, as seen from the section line -3-3of Fig. 4;

Fig. 4 is a sectional view taken on lines 4 4 of Fig. 3 showing therotary hammer or breaker alone, in vertical section on an enlargedscale; and y Fig. 5 is a section on the line 5-5 of Fig. 4.

: is the purpose of the machine to' impose a quick mounted between apair of I-beams III extending along one side of the tractor or othervehicle I2 which is designed to carry the machine. The

beams I!) support bearings I3 which journal the main shaft I5 of therotary hammer.

The beams I0 are formed with longitudinallysupported from the tractor inthis manner..

While the rotary hammer may be considered properly attached to orsupported from the tractor by the means just described, other means maybe designed to serve the purpose if they are more readily adaptable,convenient or economical.

The main shaft I5 is locked against end motion by being threaded outsidethe bearings I3 to receive securing nutsv 32.

these being freely'rotatable 'on the main shaft and the inner one havinga spur-gear peripheryV 35. The liywheels'receive between thema spiralarrangement of levers 31 pivoted at intermediate points on cross-bolts38` passing through the iiywheels 34, the cross-boltsy receivingsecuring nuts 39 outside the flywheels. The secured spacing of thelywheels is such as to permit the free pivotal motion of the levers 31.

The outer ends of the levers 31 are fitted with removable orinterchangeable hardened shoes 'lIIl extended with one or more chiselpoints. point shoe is shown in` Fig. 4. Thus, when a leverY has beencarried by the ywheels SII-'when these are rotated in a clockwisedirectionto the position indicated'in the bottom portion of Fig. 3, it

clockwise turn to the' lever, so that its shoe strikes the groundwith'force.`

The element designed to motivate, that is, to trip the levers as justmentioned comprises a `cam 42 keyed on the main shaft I5 as indicated at43. One position of the cam is lateral, as shown in Fig. 5, but the camis designed to be oscillated, whereby to act periodically as a lifterfor the heel 44 of each lever 31 descending on the right. With thelevers revolving at a rapid rate, it will be apparent 4that'the effectof the rising cam impulses thereon will be to trip the levers in quicksuccession. Where the ground is `in the form of a pavement which must bebroken up,

` the operation of the r.levers will deliver a continual succession ofsharp chisel blows elective Between the bearings` the shaft receives aspaced pair of ywheels 34,

A twin to fracture the pavement along the course over which therevolving levers travel. Also, the levers may be staggered from eachother at their outer ends, and also variously pointed, to cover a widecourse of application.

The ywheels 34 receive their motion from the power take-oir" shaft 45 ofthe tractor. Such shaft carries a pulley 46 from which a belt drive 47is transmitted to a pulley 48 extended from the outer flywheel. Theoperation of the .cam 42 is induced by the flywheels. Thus, the mainshaft l also has keyed on it at 50 a hub 5l extended with a radius arm52. One of the beams l0 receives a bearing 53 for a shaft 54 whichcarries a spur pinion 55. The latter'isin mesh with the teeth 35 of oneof the flywheels; and a pitman 56 extends from the pinion 55 to theouter end of the radius arm 52. Thus, 'the relatively high-speedrotation of the'pinion induces the rapid oscillation of the cam i2 withthe result mentioned.

It willbe apparent `that a rotary hammer constructed as described formsa compact unit which is readily .attachable to the side of Va tractor orother utility vehicle .to facilitate the rapid .fracture of a chosen.course of pavement. `Being power operated, the machine may be designedto exert as much striking force or as rapida deu livery of fracturingblows as may be needed. Further, the pivoting of the striking levers isin the .manner of hammers, and `the tripping thereof sudden, whereby .toimpart sharp blows. Further, the revolution oi" the levers renders themapplicable in rapid succession, making their blows effective and theracturing process eicient and rapid. Finally, the rotary hammer is .anassembly of few and vsimple parts `and fully automatic in operation.

While I have described ythe invention along specic lines, various minor.changes or reiinements maybe made therein without departing from itsprinciple, and I reserve the right to employ vsuch changes andrefinements as may come within the scope rand spirit of the appendedclaims.

I claim:

1. A pavement fracturing machinecomprising a support, a series of rotaryelements operative to :inflict a-successionof blows on the pavement, andpower means to revolve the elements in relation to the support, saidrotary elements being a circularly-arranged series of levers, and saidpower means comprising flywheels, means pivoting the levers to theiiywheels at intermediate points, one of the Vends of Athe levers beingfoutwardly located and designed to iniiict said blows, and oscillatingcam means in the central region of the V'iiywheels designed to trip theother ends of the levers and swing them lin a direction to inflict saidblows.

2. A pavement kfracturing machine comprising a support, a series ofrotary elements operative `to inflict a succession of blows on thepavement, and power means to revolve the elements in relation to thesupport, said support comprising a shaft, said power means beingflywheels freely rotatable on the shaft, and said rotary elements beinga circularly-arranged series of levers, means pivoting the latter to theiiywheels at intermediate points, one of the ends of the levers beingoutwardly located and designed to inict said blows, an oscillatingfcamcarried by said shaft and=designed to trip the other ends of the leversand swing them in a direction to inflict said blows, and a drive fromthe flywheels to operate Vsaid cam.

3. A pavement fracturing machine comprising a'support-a series of rotaryelements operative to inflict a succession `of blows on the pavement,'and power means to revolve the elements in relation to the support,said support comprising a shaft, said power means being lywheels freelyrotatable on the shaft, and said rotary elementsbeinga.circularly-arranged.series of levers, means pivoting the latterto the lywheels at intermediate points, one of the ends of the leversbeing outwardly located and designed to inict said blows, an oscillatingcam carried by said shaft and designed to trip the other ends of thelevers and swing them in a direction `to -iniiict said blows, oneflywheel having a peripheral gear formation, a pinion meshed with thelatter to secure a drive at multiplied speed, a radius arm control forthe cam, and a pitman from the pinion to the radius arm to induce the'oscillation of the cam when the nywheels are in rotation.

4. A pavement iracturing machine comprising a support, a series or"rotary elements operative to inflict a succession of blows von thepavement, and power means to revolve the elements in :relation to thesupport, said rotary elements being a circularl-y-arranged series oflevers, and .said power means comprising flywheels, means pivoting thelevers Vto the lywheels at Aintermediate points, vone of the ends of thelevers Abeing outwardly located and designed to inflict said blows, androckable cam means in the central region of the flywheels designed totrip the other ends of the vlevers Yand yswing -them ina direction toinict said blows.

AYERS B. PUTNAM'.

REFERENCES CITED .The fol-lowing references are of record :in the fileof this patent:

UNITED STATES PATENTS Number Name Date 1,092,632 Crain Apr. 7, 19.141,300,595 Fonnesbeck Apr. 15, 1919 1,518,505 Gray Dec. :9, 19242,009,500 Kramer July 30, 1935,

